> John Forbes Nash Jr
That's not really fair - John Nash was an exceptional person in a myriad of different ways. He's very much an exceptional case in the same way that Stephen Hawking is very much an exception when it comes to ALS.
In general, it's a pretty poor idea to confront someone suffering from disorganized thinking caused by schizophrenia about that disorganized thinking (maybe not in a clinical context, I wouldn't know). Just because John Nash was able to function to a high degree without medication doesn't mean that everyone will be able to, or that it's fair to hold everyone to that standard.